Scott Taylor d38fed6449 Add missing doc blocks to user.php. ...

`username_exists()` should return `false` instead of `null`, just like `email_exists()` does, which is right under it.

See #32444.

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git-svn-id: http://core.svn.wordpress.org/trunk@32607 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2015-05-28 15:51:25 +00:00

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